Properties of the ionized gas in HH202. I: Results from integral field spectroscopy with PMAS

Abstract

We present results from integral field spectroscopy with the Potsdam multi-Aperture Spectrograph of the head of the Herbig-Haro object HH 202 with a spatial sampling of 1"x1". We have obtained maps of different emission lines, physical conditions --such as electron temperature and density-- and ionic abundances from recombination and collisionally excited lines. We present the first map of the Balmer temperature and of the temperature fluctuation parameter, t^2. We have calculated the t^2 in the plane of the sky, which is substantially smaller than that determined along the line of sight. We have mapped the abundance discrepancy factor of O^{2+}, ADF(O^{2+}), finding its maximum value at the HH 202-S position. We have explored the relations between the ADF(O^{2+}) and the electron density, the Balmer and [O III] temperatures, the ionization degree as well as the t^2 parameter. We do not find clear correlations between these properties and the results seem to support that the ADF and t^2 are independent phenomena. We have found a weak negative correlation between the O^{2+} abundance determined from recombination lines and the temperature, which is the expected behaviour in an ionized nebula, hence it seems that there is not evidence for the presence of super-metal rich droplets in H II regions.

arXiv comment12 pages, 11 figures. Accepted for publication in MNRAS

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• Analysis of chemical abundances in planetary nebulae with [WC] central stars. II. Chemical abundances and the abundance discrepancy factor
• Analysis of two SMC HII Regions Considering Thermal Inhomogeneities: Implications for the Determinations of Extragalactic Chemical Abundances
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• A global study of the HII region M43 and its ionizing star (I. Stellar parameters and nebular empirical analysis)
• Ionized gas diagnostics from protoplanetary discs in the Orion Nebula and the abundance discrepancy problem
• Integral field spectroscopy of selected areas of the Bright Bar and Orion-S cloud in the Orion Nebula
• The Discrepant Kinematics of ORLs and CELs in NGC 7009 as a Function of Ionization Structure
• Small-spatial scale variations of nebular properties and the abundance discrepancy in three Galactic HII regions
• Exploring the effects of high-velocity flows in abundance determinations in H II regions. Bidimensional spectroscopy of HH 204 in the Orion Nebula
• Deep high spectral resolution spectroscopy and chemical composition of ionized nebulae
• The Integral Field View of the Orion Nebula
• Observing and Reducing IFUs: INTEGRAL and PMAS -- Properties of the Ionized Gas in HH 202